Sublethal Toxicity and Histological Effect of Balanites aegyptiaca Bark (Aqueous extract) on Juvenile of Clarias gariepinus (Burchell, 1822)
Ngadina EY, Sogbesan OA, Kefas M, Micheal KG
The sublethal concentration of the Balanites aegyptiaca extract on juvenile of Clarias gariepinus was assessed after exposing them for 112 days at various concentration of 14mg/L, 7mg/L, 5mg/L. and 3mg/L. The effect of the sublethal concentration on liver, gills, and gonad of fish was investigated. Like-wise the resultant effect of the extract on haematocrit percentage of the fish, growth rate and nutrient utilization of the fish was also assessed. The histological study shows that the liver was vacuolated hepatocytes with frequent necrosis, the bile canaliculi were dilated. The gills were pale and congested and the gill filaments was hyperplastic and edematous with vacuolated epithelial covering of the gill rakers. The highest feed utilization was recorded in the tank with lowest sublethal concentration of 3mg/L. While the lowest feed utilization was recorded in the tank with concentration of 14mg/L.